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Why does iron gain weight as a result of rusting ?

“Gain your weight by 5 kgs in 3 sessions” – an advertisement. Assumption 1: “ if you join in 6 sessions your Weight will be lost by 10 kgs . Assumption 2. “the company is dealing with weight gain programs”

The average weight of A, B and C is x kg. A and C lose y kg each after dieting and B gains (y)/(2) kg. After this their average weight decreases by 1 kg. Find y.

The total number of students in class A and B is 96. The number of students in A is 40% more than that in B. The average weight (in kg) of the students in B is 50% more than that of the students in A. If the average weight of all the students in A and B taken together is 58 kg, then what is the average weight of the students in B? कक्षा A और कक्षा B के कुल छात्रों की संख्या 96 है | A के छात्रों की संख्या B के छात्रों से 40% अधिक है | B कक्षा के छात्रों का औसत वज़न A के छात्रों के औसत वज़न से 50% अधिक है | यदि A और B दोनों के छात्रों का कुल औसत वज़न 58 किलो ग्राम है, तो B के छात्रों का औसत वज़न ज्ञात करें |

A mixture of FeO and Fe_3O_4 when heated in air to constant weights, gains 5\% in its weight. Calculate the composition of the mixture.